What two properties of a Cepheid variable star do we need to know in order to calculate the approximate distance from Earth? (choose two)

1.) luminosity

2.) parallax

3.) color

4.) heat intensity

5.) exact size

6.) apparent magnitude

b 1: 45 am

step-by-step explanation:

its that because if it was in the pm it would be 1345

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.